Hello everyone,
I have a question regarding empirical survival function (Kaplan-Meier). All the examples I have seen so far, I have seen that N0 at time 0 is the maximum.
S(ti) = ((Ni - di)/Ni) * S(ti-1)
Ni - number of people at risk at time ti
di number of death at time ti
After the study has begun, if new subjects have entered at time t (greater than starting point) which is making N, at that point greater than the starting N. Am I allowed to do that ?
Any example with the reference following given condition will also answer my question.
Thanks in advance.
Regards,
Irshad
No. You would not then be measuring the cumulative survival probability of the original cohort. you would be starting a new cohort.
Thank you so much for the answer sir. Can you please provide me any reference stating the same.
De Santos I: Cancer Epidemiology:Principles and Methods IARC WHO 1999 Ch 12 p263-276. (Very clear exposition).
- Badges
- Science topic
- Similar topics
- References